package com.test.gpstracker;

import com.test.followme.IGPSActivity;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.provider.Settings;
import android.util.Log;

public class GpsTracker implements LocationListener, IGPSActivity
{	
//	private final Context mContext;
	
	private final IGPSActivity gpsActivity;
	
	// flag for GPS status
	boolean isGPSEnabled = false;
	
	// flag for network status
	boolean isNetworkEnabled = false;
	
	// flag for GPS status
	boolean canGetLocation = false;
	
	Location location; // location
	double latitude; // latitude
	double longitude; // longitude
	
	// The minimum distance to change Updates in meters
	private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 0;//10; // 10 meters
	
	// The minimum time between updates in milliseconds
	private static final long MIN_TIME_BW_UPDATES = 0;//1000 * 60 * 1; // 1 minute
	
	// Declaring a Location Manager
	protected LocationManager locationManager;
	
	public GpsTracker(IGPSActivity gpsActivity)
	{
		this.gpsActivity = gpsActivity;
		getLocation();
	}
	
	public Location getLocation()
	{
		try
		{
			locationManager = (LocationManager) ((Activity) this.gpsActivity).getSystemService(Context.LOCATION_SERVICE);
			
			// getting GPS status
			isGPSEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
			
			// getting network status
			isNetworkEnabled = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
			
			if (!isGPSEnabled && !isNetworkEnabled)
			{
				// no network provider is enabled
				Log.i("GpsTracker", "getLocation error");
			}
			else
			{
				this.canGetLocation = true;
				// First get location from Network Provider
				if (isNetworkEnabled)
				{
					Log.i("GpsTracker", "isNetworkEnabled true");
					locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, MIN_TIME_BW_UPDATES, MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
					Log.d("Network", "Network");
					if (locationManager != null)
					{
						location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
						if (location != null)
						{
							latitude = location.getLatitude();
							longitude = location.getLongitude();
						}
					}
				}
				// if GPS Enabled get lat/long using GPS Services
				if (isGPSEnabled)
				{
					Log.i("GpsTracker", "isGPSEnabled true");
					if (location == null)
					{
						locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, MIN_TIME_BW_UPDATES, MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
						Log.d("GPS Enabled", "GPS Enabled");
						if (locationManager != null)
						{
							location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
							if (location != null)
							{
								latitude = location.getLatitude();
								longitude = location.getLongitude();
							}
						}
					}
				}
			}
			
		}
		catch (Exception e)
		{
			e.printStackTrace();
		}
		
		return location;
	}
	
	/**
	 * Stop using GPS listener Calling this function will stop using GPS in your
	 * app
	 * */
	public void stopUsingGPS()
	{
		if (locationManager != null)
		{
			locationManager.removeUpdates(GpsTracker.this);
		}
	}
	
	/**
	 * Function to get latitude
	 * */
	public double getLatitude()
	{
		if (location != null)
		{
			latitude = location.getLatitude();
		}
		
		// return latitude
		return latitude;
	}
	
	/**
	 * Function to get longitude
	 * */
	public double getLongitude()
	{
		if (location != null)
		{
			longitude = location.getLongitude();
		}
		
		// return longitude
		return longitude;
	}
	
	/**
	 * Function to check GPS/wifi enabled
	 * 
	 * @return boolean
	 * */
	public boolean canGetLocation()
	{
		return this.canGetLocation;
	}
	
	/**
	 * Function to show settings alert dialog On pressing Settings button will
	 * lauch Settings Options
	 * */
	public void showSettingsAlert()
	{
		AlertDialog.Builder alertDialog = new AlertDialog.Builder((Context) this.gpsActivity);
		
		// Setting Dialog Title
		alertDialog.setTitle("GPS is settings");
		
		// Setting Dialog Message
		alertDialog.setMessage("GPS is not enabled. Do you want to go to settings menu?");
		
		// On pressing Settings button
		alertDialog.setPositiveButton("Settings", new DialogInterface.OnClickListener()
		{
			public void onClick(DialogInterface dialog, int which)
			{
				Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
				((Activity) GpsTracker.this.gpsActivity).startActivity(intent);
			}
		});
		
		// on pressing cancel button
		alertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener()
		{
			public void onClick(DialogInterface dialog, int which)
			{
				dialog.cancel();
			}
		});
		
		// Showing Alert Message
		alertDialog.show();
	}
	
	@Override
	public void onLocationChanged(Location location)
	{
		Log.i("GpsTracker", "onLocationChanged");
		GpsTracker.this.gpsActivity.locationChanged(location.getLongitude(), location.getLatitude());
	}
	
	@Override
	public void onProviderDisabled(String provider)
	{
		GpsTracker.this.gpsActivity.displayGPSSettingsDialog();
	}
	
	@Override
	public void onProviderEnabled(String provider)
	{
	}
	
	@Override
	public void onStatusChanged(String provider, int status, Bundle extras)
	{
	}
	

	@Override
	public void locationChanged(double longitude, double latitude)
	{
		Log.i("GpsTracker", "locationChanged");
		// TODO Auto-generated method stub
		
	}

	@Override
	public void displayGPSSettingsDialog()
	{
		// TODO Auto-generated method stub
		
	}
	
}
